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  <title>以指定的微秒数延迟执行</title>

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</div><hr /><div id="function.usleep" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">usleep</h1>
  <p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">usleep</span> &mdash; <span class="dc-title">以指定的微秒数延迟执行</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.usleep-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>usleep</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$micro_seconds</code></span>
   )</div>

  <p class="para rdfs-comment">
   以指定的微秒数延缓程序的执行。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.usleep-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">micro_seconds</code></em></dt>

     <dd>

      <p class="para">
       暂停的时间以微秒计。1微秒（micro second）是百万分之一秒。
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.usleep-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   没有返回值。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.usleep-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.0.0</td>
       <td>
        此函数在Windows系统下可用。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.usleep-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3699">
    <p><strong>Example #1 <span class="function"><strong>usleep()</strong></span>例子</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br /></span><span style="color: #FF8000">//&nbsp;Current&nbsp;time<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'h:i:s'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">//&nbsp;wait&nbsp;for&nbsp;2&nbsp;seconds<br /></span><span style="color: #0000BB">usleep</span><span style="color: #007700">(</span><span style="color: #0000BB">2000000</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">//&nbsp;back!<br /></span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">date</span><span style="color: #007700">(</span><span style="color: #DD0000">'h:i:s'</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程会输出：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
11:13:28
11:13:30
</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.usleep-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.sleep.html" class="function" rel="rdfs-seeAlso">sleep()</a> - 延缓执行</span></li>
    <li class="member"><span class="function"><a href="function.time-nanosleep.html" class="function" rel="rdfs-seeAlso">time_nanosleep()</a> - 延缓执行若干秒和纳秒</span></li>
    <li class="member"><span class="function"><a href="function.time-sleep-until.html" class="function" rel="rdfs-seeAlso">time_sleep_until()</a> - 使脚本睡眠到指定的时间为止。</span></li>
    <li class="member"><span class="function"><a href="function.set-time-limit.html" class="function" rel="rdfs-seeAlso">set_time_limit()</a> - 设置脚本最大执行时间</span></li>
   </ul>
  </p>
 </div>


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